JPH068127A - Sanding method and device thereof - Google Patents

Abstract

PURPOSE:To precisely and efficiently perform polishing work of the surface of a work even if it is having a complicated cross sectional shape. CONSTITUTION:In the sanding method, a sanding belt V, being pushed by a pressure pad 21, is slidingly contacted with a work W retained at a fixed position over a total length of the work W to polish a surface of the work W, the work W turns around the traveling direction of the sanding belt V as its turning axis, and a copying model M perform in the same movement as the work W is juxtaposed. A belt guiding sensor 24 abutting on this colying model M for detecting the surface shape thereof is provided, and the pressure pad 21 is made to perform the same movement in accordance with the position of this belt guiding sensor 24.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for polishing a work surface by bringing a sanding belt into sliding contact with the work surface by pressing a pressure pad against the back surface of a running sanding belt. In particular, the present invention relates to a sanding method and apparatus for rationally polishing a work surface by using a copying model.

[0002]

BACKGROUND OF THE INVENTION When machining a woodworking work using a belt sander, if the cross-sectional shape is relatively complicated, a part of the sanding belt is guided by a pressure pad to partially fold the work and process the work. Profile processing is performed so that it acts evenly on the surface to be processed.On the other hand, when the surface to be processed of the work is a simple flat surface, the sanding belt is slid on the work and processed. Is going.

In this case, in the profile processing method, due to the rigidity of the belt itself, the range in which the belt is guided by the pressure pad is narrow, so to speak, the belt reproduces the work cross-sectional shape at one point.
In order to process the entire work of a certain size, it is necessary to move the work side, and a work transfer device must be installed separately.

On the other hand, when the work to be processed has a relatively simple shape, the sanding belt remains flat, so that the sanding belt can be acted at once over the entire length of the work. Since it is possible to perform the entire fixed-position processing without the transfer of the work, there is also a convenient aspect that such a work transfer device is unnecessary.

By the way, the shape of the work surface of the work should be located in the middle of what is called profile processing and what is suitable for stationary whole area processing, such as one having a convex shape at the center. If you try to machine all shapes with a fixed shape, it is not enough to simply rotate the work piece at a fixed position as in the past, but it is not possible to perform sufficient processing to meet the user's request. there were.

[0006]

[Technical Items Attempted to Solve] The present invention has been made from such a background, and it is assumed that the work surface of the work is other than a flat surface, or the top surface and the side surface are processed while presuming the stationary whole area processing. The present invention proposes a new sanding method and apparatus that can perform a rational processing even when processing all at once.

[0007]

[Constitution of the invention]

[Means for Achieving the Object] That is, in the sanding method according to the first invention of the present application, the sanding belt pressed by the pressure pad slidably contacts the work held in a fixed position over the entire length of the work to polish the surface of the work. In the method, the work is rotated about the traveling direction of the sanding belt, and a copy model that makes the same movement as the work is arranged side by side, and further abutted on the copy model to detect the surface shape of the copy model. Provide a guidance sensor,
The pressure pad is made to perform the same movement according to the position of the belt guide sensor.

A second invention according to the present invention is a sanding apparatus comprising a work holding device for holding a work in a fixed position and a sanding unit for driving a sanding belt for polishing the work surface, wherein the work holding device is provided. The apparatus includes a work holding head and a copying model holding head that performs the same movement as the work holding head, and the sanding unit further performs a belt guiding sensor that abuts the copying model and performs the same movement as the belt guiding sensor. The back surface of the sanding belt is provided with a pressure pad for restricting the running surface of the sanding belt. The above objects are intended to be achieved by these inventions.

[0009]

According to the present invention, in addition to the work holding head in the work holding device, the copying model holding head is provided and the movements thereof are synchronized, so that the copying model moves up and down.
If it slides back and forth, the workpiece also slides for the same stroke,
Further, if the copy model rotates, the workpiece also rotates by the same rotation angle. Further, according to the present invention, a belt guide sensor that comes into contact with this copying model and recognizes its shape is provided, and the movement of this belt guiding sensor and the movement of the pressure pad are synchronized, so that the belt guiding sensor has the shape of the copying model. Depending on the above, the pressure pad also moves up and down by the same stroke by rotating up and down or by the same rotation angle. Therefore, the work holding device and sanding unit
Through the copy model, the movements are synchronized with each other.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sanding method and apparatus of the present invention will be specifically described below with reference to the drawings. As for the order of description, the structure of the sanding apparatus of the present invention will be described first, and then the sanding method of the present invention using this apparatus will be described. In the drawings, reference numeral 1 denotes a sanding device of the present invention, which is a work having a relatively long cross-sectional shape in the length direction, such as a tabletop or legs of a table for a table. Used for W polishing. It should be noted that the cross-sectional shape of the work W can be variously supported, and the work W has an elliptical shape as shown in FIG. 6A, the work W has a chevron shape as shown in FIG. Kamaboko-shaped work W as shown in FIG.
The applicable range is extremely wide, such as those having a complicated curved surface shape as shown in (d).

In the sanding apparatus 1 of the present invention used for polishing the surface of the work W as described above, the columns 3 are raised from the left and right ends of the base 2, and the horizontal rails 4 are hung on the columns. A machine frame 5 formed by handing over and assembling in a rectangular shape as a whole is used as a frame member. Further, with respect to the machine frame 5, a work holding device 10 is provided at a lower portion and a sanding unit 20 is provided at an upper portion, and a book holder is provided by these. The sanding device 1 of the invention consists.

First of all, the work holding device 10 will be described. The work holding device 10 engages with the guide rails 3a provided inside the left and right columns 3 of the machine frame 5 and slides up and down in the vertical direction. A slide table 13 that engages with a guide rail 12 provided on the upper surface of the lifting bed 11 and slides in the front-rear direction, and this slide table 1
3, a copy model holding head 14 and a work holding head 15 provided on the upper surface of the work 3, and a work supporting base 16.

More specifically, the elevating bed 11 is located at the bottom of the work holding device 10. For example, a bed frame 11a having a gate shape is provided on the left and right end surfaces of the bed frame 11a with the guide rails 3a. A rail holder 11b to be engaged is provided, and a shaft holder 11c to be screwed with a screw shaft 31 in an elevating device 30 described below is further provided. The elevating device 30 is provided for the lower half of the base 2 and the left and right columns 3 of the machine frame 5. Specifically, as an example, an elevating motor M ₁ is provided on the lower end outer surface of the right column 3, and a horizontal rod 32 that is connected to the output shaft of the elevating motor M ₁ and rotates rotates to the lower end outer surface of the left column 3. The worm wheel 33 is formed so as to extend to the left and right, and the worm wheel 33 that corrects and transmits the rotation direction is provided inside the left and right stanchions 3 and extends vertically in the position close to the guide rails 3a. ing.

The slide table 13 is a relatively thick flat plate member that can withstand sufficient rigidity, and a rail holder 13a that engages with the guide rail 12 is provided on the lower surface of the slide table 13 and further a lifting bed. A shaft holder (not shown) that is connected to the output shaft of a slide motor M ₂ provided on the rear end surface of the bed frame 11a of 11 and is screwed with a screw shaft (not shown) that extends forward is also provided. . Further, on the upper surface of the slide table 13, the copy model holding head 14 and the work holding head 15, and the work support 16 are provided.
Is provided. Among them, the copy model holding head 14 and the work holding head 15 are provided on a movable base 35 which is engaged with a dovetail 13b formed in the center of the slide table 13 over the entire length in the left-right direction and can slide in the left-right direction. Incidentally, two movable bases 35 are provided so as to face each other, and are configured to approach and separate by operating a handle 36 provided on the side portion of the left movable base 35.

The right movable base 35R of the movable bases 35 has a driving chuck 37 for the copying model holding head 14 and the work holding head 15 and a holding side for synchronizing the movements of the copying holding head 14 and the work holding head 15. A tuning mechanism 38 is provided. The holding side tuning mechanism 38 is located between the driving chuck 37 of the copying model holding head 14 and the driving chuck 37 of the work holding head 15 which are arranged in front of and behind the right movable base 35R.
The configuration is such that the drive model 39 attached to the output shaft of the drive motor M ₃ located at the center is rotated by the idle gear 40 provided symmetrically to the front and rear, and the model holding head 14 and the work holding head 15 are driven by the respective models. This is transmitted to the driven gear 41 that rotates together with the drive chuck 37.

These drive gear 39 and idle gear 4
0 and the driven gear 41 are on the copy model holding head 14 side,
The work holding head 15 side is configured to have the same gear ratio, and each drive chuck 37 that receives the rotation of the drive motor M ₃ moves symmetrically in the same rotation direction at the same rotation angle. A rotary encoder 42 is provided below the driven gear 41 on the side of the work holding head 15. The rotary encoder 42 sends the rotational angle displacement of the drive chuck 37 in the work holding head 15 to a control device (not shown) as occasion demands. It is used for controlling the rotational speed of the drive motor M ₃ and checking the origin position of the drive chuck 37.

Further, as such a holding side tuning mechanism 38, the following embodiments can also be adopted. That is, FIG.
As shown in FIG.
In the case of using the balance cylinder 46, the slider of the balance cylinder 46 is attached to the end of the support bracket 45 projecting from the lower surfaces of the left and right ends of the holding base 44, and the balance cylinder 46 is held by expansion and contraction of the slider. The table 44 is rotated around a rotating shaft 47, and a similar mechanism is provided on the copying model holding head 14 side as well, whereby the movements of the balance cylinders 46 are interlocked with each other, whereby the copying model holding head 14 and the workpiece are linked. The movement of the holding head 15 can also be synchronized.

The left movable base 35L has each drive chuck 3 provided on the right movable base 35R.
A driven chuck 49 is provided on the same axis as the drive chuck 7. The driven chuck 49 is supported in an idling state, one end of the driven chuck 49 is fixed by a chucking cylinder 50, and the driven chuck 49 is retractable. That is, the workpiece W and the copy model M are roughly chucked by operating the handle 36, and the final clamping action is performed by the chucking cylinder 50.

In addition, a work supporting base 16 is provided on the slide table 13. The work supporting base 16 pushes a pressure pad 21, which will be described later, which acts on the work W when polishing the work W. It plays a role of supporting the work W from below so that the holding posture of the work W is not inclined by the pressure. Therefore, it is desirable that the bearing height can be adjusted by the thickness of the work W.

Next, the sanding unit 20 located above the work holding device 10 having such a structure will be described. In the sanding unit 20, the sanding belt V is wound in a rectangular loop shape as an example, a pressure pad 21 is brought into contact with a part of the back surface of the sanding belt V, and the sanding belt runs by projecting the pressure pad 21 toward the work W side. The V is brought into sliding contact with the work W to perform the polishing process.

The construction is such that the traveling model 22 of the sanding belt V, the suspension mechanism 23 for controlling the vertical movement of the pressure pad 21, and the copying model M held by the copying model holding head 14 are brought into contact with each other. The belt guide sensor 24 detects its shape and size, and the processing side tuning mechanism 25 for synchronizing the movement of the belt guide sensor 24 with the pressure pad 21.

Of these, the traveling mechanism 22 is provided with a drive pulley 52 and a tension pulley 53 on the horizontal crosspiece 4 at the right end and the left end, respectively, and guide pulleys 54 are provided at the upper and lower sides of the left and right columns 3, respectively. A sanding belt V is wound between the tension pulley 53 and the guide pulley 54, the output shaft of the traveling motor M ₄ is further connected to the drive pulley 52, and a tension cylinder 55 slides to the tension pulley 53. The slider 57 that slides on the slide rail 56 laid on the horizontal rail 4 in response to expansion and contraction of the slider 57 is provided.

The suspension mechanism 23 is composed of the pressure pad 21.
And a holding frame 26 for holding the belt guide sensor 24
2 suspension cylinders 59 are arranged side by side in the approximate center of the horizontal rail 4, and a suspension chain 60 is connected to the slider, and the suspension chain 60 is extended forward. After that, it is wound around the guide sprocket 61 and hung downward, and is connected to the holding frame 26 at its end.

The belt guide sensor 24 is a swing frame 27 which is symmetrically provided in front of and behind the holding frame 26.
The guide-side rocking frame 27M is located at the rear of the guide-side rocking frame 27M. In the embodiment shown in FIGS. 1 to 4, a guide roller 24a is provided on the lower surface of the copy-side rocking frame 27M. By rolling on the copying model M, the geometrical dimensions of the copying model M are transmitted to the processing side tuning mechanism 25 described later. As the belt guide sensor 24, not only the shape and size of the belt guide sensor 24 can be recognized by contacting the copying model M, but also a non-contact type sensor using a photoelectric sensor or the like can be adopted.

Further, once the shape and size of the copying model M is recognized by the belt guide sensor 24, the data may be stored by the control device, and the subsequent processing may be performed based on this data. . Further work W
Enter the machining dimensions of
It is also possible to perform processing based on the input numerical value. In the case of such a method, the belt guide sensor 24 does not have a role of recognizing the shape and size of the copying model M, but the work W of the pressure pad 21 that moves in synchronization with the belt guide sensor 24.
The belt guide sensor 24 is still one of the characteristic constituent features of the present invention.

Then, the processing side tuning mechanism 25 moves the movement of the copying side swing frame 27M to the work side swing frame 27W.
1 to 4, in the embodiment shown in FIGS. 1 to 4, bearings 63 are provided on the swing frames 27 on the copying side and the work side respectively, and a swing gear 64 is provided on the shaft portion fitted to the bearings 63. Further, a sprocket 66 is provided on the same rotary shaft as the driven gear 65 meshing with the swing gear 64, and the chain 6 is provided between the sprocket 66 on the copying side and the work side.
7 is wound. 1 to 4, reference numeral 68 indicates a model M that the belt guide sensor 24 follows.
It is a cushion cylinder that absorbs the impact when it comes into contact with. Further, as the processing side tuning mechanism 25, other various mechanisms such as one using a parallel link and one using a gear like the holding side tuning mechanism 38 can be adopted. This also applies to the holding side tuning mechanism 38.

The structure of the sanding apparatus 1 of the present invention has been described above. The sanding method described below is used to actually polish the surface of the work W using this structure. First, the worker sets the copying model M on the copying model holding head 14 as a preparatory work. When setting the copying model M, the handle 36 is operated to perform rough chucking as described above, and then the slider of the chucking cylinder 50 is extended to fix the copying model M. .

Then, the slider of the suspension cylinder 59 is extended, and the holding frame 26 is lowered until the belt guide sensor 24 contacts the copying model M. Then, the operator activates the traveling mechanism 22 in the sanding unit 20 by pressing the activation switch to cause the sanding belt V to travel, and sets the work W on the work holding head 15 in the same manner as the model M, and further on the work support base. 16
The lower surface is supported by and the sanding device 1 is driven by pressing a predetermined operation switch.

Then, the belt guide sensor 24 rises, descends, or oscillates in accordance with the shape of the copying model M, and the movement is transmitted to the oscillating gear 64, and further transmitted to the driven gear 65 meshing with the oscillating gear 64, so that the chain. The same movement as that of the belt guide sensor 24 is transmitted to the work-side swing frame 27W via 67. The pressure pad 21 provided for the work-side swing frame 27W
Similarly to the work-side swing frame 27M, it also rises, falls, and swings to change the working surface of the sanding belt V at any time.

On the other hand, the work holding device 10 also drives the drive motor M ₃ to operate the holding side tuning mechanism 38 to polish the entire surface of the work W so that the copying model M and the work W are at the same angle. The work W is rotated, and along with this, the lifting bed 11 and the slide table 13 are moved up and down and slid back and forth to move the work W to the optimum point for processing. After finishing polishing all the surfaces of the work W, the sanding unit 20 is stopped, the work W is not held by the work holding device 10, the next work W is set, and the same procedure is repeated. Good.

[0031]

The sanding method and apparatus according to the present invention are constructed as described above, and by having such construction, the following effects are exhibited.
First, by using the copy model M that has been machined into the same shape as the product in advance, the shape and size of the work W can be read easily. Further, the movement of the copying model M and the movement of the work W are synchronized with each other, and the movement of the belt guide sensor 24 that abuts on the copying model M and the pressure pad 21.
And the movement of the workpiece W, or the movement of the belt guide sensor 24 and the pressure pad 21 have a one-to-one correspondence, so that reading and data processing are performed. , Output does not cause any problematic conversion error.

Further, even when the work W is processed based on the data once recognized by the belt guide sensor 24 and stored in the control device or the data input numerically, the belt guide sensor 24 follows the shape of the copying model M. By responding, this acts as a guide member, and plays a role of smoothing the follow-up of the work W by the pressure pad 21 that moves in synchronization with the belt guide sensor 24. Therefore, these effects act synergistically, and even the work having a complicated cross-sectional shape, which has been difficult to automate in the past, can be machined in the entire stationary area, which enables highly accurate and efficient polishing. Of.

[Brief description of drawings]

FIG. 1 is a perspective view showing a sanding device of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a right side view of the above.

FIG. 4 is an enlarged perspective view showing a holding side tuning mechanism and a processing side tuning mechanism.

FIG. 5 is a perspective view showing another embodiment of the holding side tuning mechanism.

FIG. 6 is a perspective view showing an example of a work piece polished by a sanding device of the present invention.

[Explanation of symbols]

1 Sanding Device 2 Base 3 Pillar 3a Guide Rail 4 Horizontal Rail 5 Machine Frame 10 Work Holding Device 11 Lifting Bed 11a Bed Frame 11b Rail Holder 11c Shaft Holder 12 Guide Rail 13 Slide Table 13a Rail Holder 13b Ali 14 Copy Model Holding Head 15 Work holding head 16 Work support 20 Sanding unit 21 Pressure pad 22 Traveling mechanism 23 Suspending mechanism 24 Belt guide sensor 24a Guide roller 25 Processing side tuning mechanism 26 Holding frame 27 Swing frame 27M Copy side swing frame 27W Work side swing Frame 30 Lifting device 31 Screw shaft 32 Horizontal rod 33 Worm wheel 35 Movable base 35R Right movable base 35L Left movable base 36 Handle 37 Dynamic chuck 38 Holding side tuning mechanism 39 Drive gear 40 Idle gear 41 Driven gear 42 Rotary encoder 44 Holding base 45 Support bracket 46 Balance cylinder 47 Rotating shaft 49 Driven chuck 50 Chucking cylinder 52 Drive pulley 53 Tension pulley 54 Guide pulley 55 Tension Cylinder 56 Slide rail 57 Slider 59 Suspended cylinder 60 Suspended chain 61 Guide sprocket 63 Bearing 64 Swing gear 65 Driven gear 66 Sprocket 67 Chain 68 Cushion cylinder M Copy model M ₁ Lifting motor M ₂ Slide motor M ₃ Drive motor M ₄ Traveling motor V Sanding belt W Work

Claims (2)

[Claims] 1. A method of polishing a surface of a work by a sanding belt pressed by a pressure pad slidingly contacting a work held in a fixed position over the entire length of the work, wherein the work is a rotating shaft in a running direction of the sanding belt. As a result, a copy model that moves in the same way as the work is arranged in parallel, and a belt guide sensor that detects the surface shape of the copy model that is in contact with the copy model is provided. A sanding method characterized in that the pads are made to perform the same movement. 2. An apparatus comprising a work holding device for holding a work in a fixed position and a sanding unit for driving a sanding belt for polishing the work surface, wherein the work holding device includes a work holding head, and the work holding head. The sanding unit further comprises a copying model holding head that performs the same movement, and the sanding unit performs the same movement as the belt guide sensor that comes into contact with the copying model, and the running surface of the sanding belt on the back surface of the sanding belt. A sanding device characterized by comprising a pressure pad for regulating.